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Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures ..... when ocean waters are warm, poor, clear and agitated, a fact which Darwin had already noted when he passed through Tahiti in 1842.


Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. About one-third of all marine fish species live ...


Facts and information about coral reefs; including reef structure, marine life, and distribution.


Corals, sponges and seaweeds cover most of the surface of many coral reefs. Credit: Wolcott Henry. Coral reefs are the most diverse of all marine ecosystems.


LOCATION: Coral reefs are generally found in clear, tropical oceans. .... Surf the Internet for information about coral reefs and marine conservation organizations.


Coral reefs are home to 25% of all marine life on the planet. In fact the variety of life supported by coral reefs rivals that of the tropical forests of the Amazon or ...


Fact 2: A coral reef isn't a “thing,” it's actually a community of life that lives and thrives in one location. What we think of as the base of the reef (and what we see  ...


Oct 8, 2013 ... Coral reefs are large underwater structures composed of the skeletons of coral, which are marine invertebrate animals.


Meet the tiny organisms that combine to create the world's great tropical reefs. Find out about the threats that imperil corals worldwide.